(plaintiffs brought suit against former attorney for negligence and breach of fiduciary duty by attorney and his LLC established to secure plaintiffs’ loans; plaintiffs contend the breach renders the mortgages unenforceable; defendant brought counterclaim for unpaid legal fees and to foreclose on mortgage; jury found for defendant on negligence claims and court awarded unpaid attorney fees to defendant; in separate proceeding, court ordered in rem judgment in favor of defendant on agricultural property; plaintiffs appealed claiming failure of defendant to obtain mediation release before filing counterclaim seeking to foreclose on agricultural property meant district court lacked jurisdiction to hear counterclaim; appellate court held counterclaim foreclosing on agricultural property required mediation release in accordance with Iowa Code Sec. 654A, so district court lacked subject matter jurisdiction; matter reversed and remanded for dismissal of counterclaim without prejudice).